Uhlrich, J. J., Sainio, J., Lei, Y., Edwards, Dyfan, Davies, Robert J., Bowker, Michael  ORCID: https://orcid.org/0000-0001-5075-1089, Shaikhutdinov, S. and Freund, H.-J.
2011.
Preparation and characterization of iron-molybdate thin films.
Surface Science
605
(15-16)
, pp. 1550-1555.
10.1016/j.susc.2011.05.028
|
Abstract
Mixed Fe–Mo oxides are used in industrial catalytic processes of selective oxidation of methanol to formaldehyde. For better understanding of the structure-reactivity relationships of these catalysts we aim to prepare well-ordered iron–molybdate thin films as model catalysts. Here we have studied Mo deposition onto Fe3O4 (111) thin films produced on Pt(111) as a function of Mo coverage and annealing temperature using LEED, AES, STM and IRAS. At low temperatures, the iron oxide film is covered by Mo = O terminated molybdena nanoparticles. Upon oxidation at elevated temperatures (T > 900 K), Mo species migrate into the film and form new bonds with oxygen in the film. The resulting films maintain the crystal structure of Fe3O4, and the surface undergoes a (√3 × √3)R30° reconstruction. The structure is rationalized in terms of Fe substitution by Mo in the surface layers.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Research Institutes & Centres > Cardiff Catalysis Institute (CCI) Schools > Chemistry |
| Subjects: | Q Science > QD Chemistry |
| Uncontrolled Keywords: | Iron–molybdates; Thin films; Scanning tunneling microscopy; Infrared spectroscopy |
| Publisher: | Elsevier |
| ISSN: | 0039-6028 |
| Last Modified: | 18 Oct 2022 13:08 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/12417 |
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